import { CSSResultGroup, PropertyValues, TemplateResult, LitElement } from 'lit';

declare const SbbOptGroupElement_base: import('../../core/mixins.js').AbstractConstructor<import('../../core/mixins.js').SbbDisabledMixinType> & import('../../core/mixins.js').AbstractConstructor<import('../../core/mixins.js').SbbHydrationMixinType> & typeof LitElement;
/**
 * It can be used as a container for one or more `sbb-option`.
 *
 * @slot - Use the unnamed slot to add `sbb-option` elements to the `sbb-optgroup`.
 */
export declare class SbbOptGroupElement extends SbbOptGroupElement_base {
    static styles: CSSResultGroup;
    /** Option group label. */
    label: string;
    private _negative;
    private _negativeObserver;
    private get _options();
    connectedCallback(): void;
    protected willUpdate(changedProperties: PropertyValues<this>): void;
    disconnectedCallback(): void;
    private _setVariantByContext;
    private _handleSlotchange;
    private _proxyGroupLabelToOptions;
    private _proxyDisabledToOptions;
    private _highlightOptions;
    private _onNegativeChange;
    protected render(): TemplateResult;
}
declare global {
    interface HTMLElementTagNameMap {
        'sbb-optgroup': SbbOptGroupElement;
    }
}
export {};
//# sourceMappingURL=optgroup.d.ts.map